kmemleak: Enable the building of the memory leak detector

This patch adds the Kconfig.debug and Makefile entries needed for
building kmemleak into the kernel.

Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>

2 files changed, 23 insertions, 0 deletions

diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
index 6cdcf38f2da9..5cc3506574e9 100644
--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -336,6 +336,28 @@ config SLUB_STATS
           out which slabs are relevant to a particular load.
           Try running: slabinfo -DA
 
+config DEBUG_KMEMLEAK
+        bool "Kernel memory leak detector"
+        depends on DEBUG_KERNEL && EXPERIMENTAL && (X86 || ARM) && \
+                !MEMORY_HOTPLUG
+        select DEBUG_SLAB if SLAB
+        select SLUB_DEBUG if SLUB
+        select DEBUG_FS if SYSFS
+        select STACKTRACE if STACKTRACE_SUPPORT
+        select KALLSYMS
+        help
+          Say Y here if you want to enable the memory leak
+          detector. The memory allocation/freeing is traced in a way
+          similar to the Boehm's conservative garbage collector, the
+          difference being that the orphan objects are not freed but
+          only shown in /sys/kernel/debug/kmemleak. Enabling this
+          feature will introduce an overhead to memory
+          allocations. See Documentation/kmemleak.txt for more
+          details.
+
+          In order to access the kmemleak file, debugfs needs to be
+          mounted (usually at /sys/kernel/debug).
+
 config DEBUG_PREEMPT
         bool "Debug preemptible kernel"
         depends on DEBUG_KERNEL && PREEMPT && (TRACE_IRQFLAGS_SUPPORT || PPC64)
diff --git a/mm/Makefile b/mm/Makefile
index ec73c68b6015..cb84a025fdbf 100644
--- a/mm/Makefile
+++ b/mm/Makefile
@@ -38,3 +38,4 @@ obj-$(CONFIG_SMP) += allocpercpu.o
 endif
 obj-$(CONFIG_QUICKLIST) += quicklist.o
 obj-$(CONFIG_CGROUP_MEM_RES_CTLR) += memcontrol.o page_cgroup.o
+obj-$(CONFIG_DEBUG_KMEMLEAK) += kmemleak.o